research
Endocytosis of PEGylated nanoparticles accompanied by structural and free energy changes of the grafted polyethylene glycol
By Ying Li, Martin Kröger, Wing Kam Liu
Composite Manufacturing Process Modeling Using Poromechanics
Modeling and simulation of manufacturing of advanced composite material is a must in today's industry as the use of advance composites is increasing dramatically. The aim is to reduce the number of trial and error by development of a simulation tool to model and predict the manufacturing fundamental phenomena happening simultaneously in different scales. Poromechanics is a multidisciplinary and multiphysics concept which can be used to achieve this goal.
Constitutive modeling of tension-torsion coupling and tension-compression asymmetry in NiTi shape memory alloys
A 3D constitutive model is proposed and verified with experimental data. Tension-torsion coupling effect and tension-compression asymmetry effect is investigate for tube shape memory alloy.
buckling of channel section
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hi everyone,
i am doing my dissertation on buckling of channel section. so i have used abaqus software to do the analysis. i did the modelling and applided unit load n given pinned-pinned end condition. and i have used constraints to both ends such that the load applied on the edge is concentrated at a point .
but the results i.e mode shapes are not coming properly even the eigen values are very less compaired to calculated buckling load.
plz help me out.
dimensions of specimen channel section
width of web 100mm
width of flange 50mm
A thermodynamically-consistent microplane model for shape memory alloys
In this paper, a macroscopic model in a thermodynamically-consistent framework for shape memory alloys is proposed.
Stretchable and Transparent Hydrogels as Soft Conductors for Dielectric Elastomer Actuators
A soft ionic conductor can serve as an artificial nerve in an artificial muscle. A polyacrylamide hydrogel is synthesized containing a hygroscopic salt, lithium chloride. Two layers of the hydrogel are used as ionic conductors to sandwich a dielectric elastomer and fabricate a highly stretchable and transparent actuator. When the two layers of the hydrogels are subject to a voltage, the actuator reduces its thickness and expands. An areal strain of 134% is demonstrated.
Journal Club: Overcoming Challenges in Mechanically Actuating Liquid-Crystalline Elastomers
Smart materials are designed to have a controlled response to external stimuli. Shape-memory polymers (SMPs) are one of the most well known classes of mechanically active smart materials and have experienced an incredible amount of research attention over the last decade. They are able to recover programmed deformations when heated above a thermal transition; however, are generally considered a one-time event. Liquid-crystalline elastomers (LCEs) are another class of actively moving polymers; however, these materials can demonstrate reversible and repeatable shape memory without the need for “re-programming” after each actuation cycle.
Electromechanical deformation of dielectric elastomer in two types of pre-stretch
A pre-stretched dielectric elastomer is capable of large deformation, when subject to voltage. This paper investigates the effect of two types of pre-stretch: by strain and by stress. The difference is compared and discussed using thermodynamics models. The significance of the pre-stretch in actuation is explained by examining the true stress in actuation. Under both pre-stretch strategies, during the actuation, the dielectric elastomer exhibits hysteresis loops due to snap-through but differs in shape and physical quantity.
